216 REV. 0. P. CAMBRIDGE ON [ Mar. 16, 
caput ; and within the excavation at its larger end, just behind the 
hind lateral eye, is a shining, silvery, roundish spot; the clypeus 
is full and prominent, its height appearing slightly to exceed half. 
that of the facial space ; a few short hairs directed downwards are 
disposed on the space between the fore and hind central pairs of 
eyes. 
“ The eyes are very minute, but disposed in the usual four pairs, and 
seated on black spots; those of the upper or hind central pair appear 
to be the smallest of the eight; they are seated just in front of the 
summit of the cleft which divides the two lobes of the caput, and 
each is about an eye’s diameter on one side of a dark, yellow-brown, 
longitudinal line running along the bottom of the cleft ; the other 
three pairs of eyes are in a nearly straight transverse line at the 
upper part of the lower segment of the caput; those of the fore 
central pair are rather larger than those of the hind central, con- 
tiguous to each other, dark-coloured, and forming a line not quite 
as long as those of that pair. The eyes of each lateral pair are 
placed obliquely, but not quite contiguous to each other, the fore 
laterals being the largest of the eight, and each is separated by 
about a diameter’s distance from the eye nearest to it of the fore 
central pair; the distance between the fore and hind central pairs 
is about equal to that from between the eyes of one lateral pair to 
between those of the other ; looked at in front the fore laterals and 
fore centrals form a straight transverse line. 
The degs are moderate in length and strength ; their relative length 
apparently 4, 1, 2, 3, though the difference between those of the 
first and fourth pairs is exceedingly small; they are furnished with 
hairs; and each has one or two short prominent dark bristles on 
the uppersides. 
The palpi are rather short and slender ; the cubital is longer but 
less strong than the radial joint: this latter has its fore extremity 
on the upperside rather expanded, with two small promineut points, 
or the fore extremity may be described as having its upper margin 
emarginated ; the digital joint is small, and the palpal organs pro- 
minent and well-developed, but not very complex, with a minute 
curved, dark, filiform tapering spine at their extremity. The mazille, 
labium, and sternum present no unusual feature either in form or 
structure. 
The falces are moderate in length and tolerably strong; they are 
inclined backwards to the labium, and are armed with a few small 
sharp teeth towards the extremity on their inner margins. 
The abdomen is of ordinary form, and projects (but not greatly) 
over the base of the cephalothorax ; it is of a dull brownish yellow 
colour, a large oval pateh at the hinder extremity on the upper- 
side being pale luteous (this may, however, be accidental) and thinly 
clothed with hairs. 
Although allied to 2. bifrons (Bl.), it may easily be distinguished 
by the greater development and wider spread of the ovate lobes of 
the caput, as well as by a totally different position of the eyes, 
which are much smaller, and by a different colouring of the whole 
